Tank water-heater.



G. F.. SCHWARTZ.

TANK WATER HEATER.

APPLICATION man ocr. 3o. 1915.

,LQlO Paented Feb. 25, 19H).

2 SHEETSSHEET 1.

G. F. SCHWARTZ.

TANK WATER HEATER.

APPLICATION FILED OCT. 30. |915.

2 SHEETS-SHEET 2.

Patented Feb. 25, 19M).

@Nil AT enanann'r n. scnw'rlz, or sr. Louis, inrss'euar.

TANK WYATERQHEALTEJR.,

Specioation o' Letters Eatent.

Patented Feb. 25, 15.9199.

.application led Octobero, 1915. Serial No. 58,927.

lThis invention relates to' improvements.

in and relating to tank water heaters, and has for its object to providea heater of thls character whereby -water may be more quickly heatedthan with heaters heretofore used, and whereby a great saving in gas maybe obtained by burning by a second combustion the unconsumed gases ofthe first combustion, thereby also doing away with the danger from suchheaters of carbon monoxid gas, hydrocarbons, etc. A further object ofthe invention is to provide such a heater whereby the `water may beautomatically kept at a uniform temperature.

`With these and other objects in view, my invention consists of thenovel features, arrangement and combination of parts, hereinafter morefully described and pointed out in the'claims. p

In the drawings,

Figure 1 is a side elevational view of my improved tank water heater;

Fig. 2 is a vertical sectional View thereof;

Fig. 3 is a cross-sectional view on the line 3-3 of Fig. 2;

Fig. 4 is a sectional view with parts broken away showing a` modifiedform of burner; l l

Fig. 5 is a cross-sectional view taken on the line 5 5 of Fig. 4;

Fig. 6 is a ross-sectional view showing a further modi ed form ofburner; and

Figs. 7 andl 8 are sectional views of still further modified forms.

Similar reference numerals indicate corresponding parts throughout theseveral views.

Referring tothe drawings, and more particularly to Figs. 1 and 2thereof, the invention comprises a water tank having an outer wall 2 andan inner core 3, enlarged at the lower portion thereof as shown at 4.'As .shown in Fig. 2, the reduced upper portion of the core 3 is of muchgreater length or -rather height than the enlarged lower portion 4, andthe connection of these two portions is cected b v a gradually-taperingor conical intermediate portion. The said water tank is preferablyconstructed of galfvanized iron electrically welded, and in- .closed inan outercasing of asbestos 5. A cold water inlet-pipe 6 projects throughthe top of the tank and at suitable places on the side walls areprovided range water back connections 7. The lower end of the inlet pipe6 is preferably arranged to discharge water against the outwardly-Haringupper surface of said tapering intermediate portion of the inner core 3,so that the water will be deflected outwardly as it strikes 'saidsurface. Extending through the core 3 is a copper circulation tube 8connected to the said water tank or to the water jacket of a burner atthe bottom thereof as hereinafter described and extending spirallyupward in the core through a vent 9to a three-way joint or T 10', towhich is also connected. a hot water pipe 11 to the water tank and a hotwater outlet-pipel 1Q. Corresponding to the shape of the inner core 3,4, the circulation coil 8 has its major upper portion of t reduceddiameter, while the lower portion is of greater diameter but of smallerlength or rather height'than said upper.` portion.

A double combustion burner 1s provided directly under the circulationtube 8, comprising a burner 13 'of superposed rings spaced apart asshown, or a cylinder having sawe-d slots in the outercircurnference, andprovided with a top plate '14 and a feed pipe 15 of the Bunsen burnertype which is connected to the gas pipe 16. Above the top plate 14 issecured a plate 17 provided with circumferentially arranged series ofholes 18 and 19 and a downwardly depending fiange 2O extending below theburner 13. This flange is for the purpose of catching such gases as arenot consumed in the first combustion at the burner 13, allowing them topass through the holes 18 and 19 and burn above the same. A

In one form of construction shown in Fig. 2, a Water channel Q1 iscircumferentially arranged about the flange 20, and is connected to thewater tank by an inlet pipe 22, and connected to the circulating pipe 8lby an outlet pipe 23, so that the water before passing into the saidcirculating pipe is heated in the channel about the burner v13. lnanother form shown in Figs. 4 and 5, a circumferential water channel 24is provided around the flange 20 in which is arranged a diaphragm tube8, so that the water passing through this channel to be heated must gocompletely around the same before going to the said circulating tube. Inthe form shown in Fig. 6, no water channel is provided on the burner,the water being entirely heated in the circulating tube 8, which isconnected to the water tank at 28, or if desired, the tube may bebrought down and around the burner, either encircling the flange 2O asshown at 29a in Fig. T, or the 'burner 13 as at 30a in Fig. 8.

A. thermostatic valve is connected to the water tank at 29 forcontrolling the gas sup ply to the burner, which consists ofan exteriorcasing 30 provided at-the top and bot` tom with suitable extensions 31and 32, in which are guided the end portions 33 and 34 of a thermostaticmember; Between the portions 33 and 34 is located a plurality ofexpansible members 35 forming the thermostatic element, and to the'endportion 34 is connected a spring 36 adjustable within the extension 32.Secured to the casing 3D is a valve-housing` 37 having an outer seat 38upon which the valve 39 may rest and close the passage leading to thegaspipe 16 and an inner valve seat 40, which, when the valve is seatedthereon permits gas to flow from the pipe 41,to the4 pipe 16. Avalvestem 42 is provided on the valve 39 having a slot in which arearranged opposing knife-edges 43 and 44 and is guided in its movement bya socket 45 in the casing. A lever 46 is pivoted to a projection 47 ofthe casing 30, to the upper end of which is pivated the tilting lever48, one end of which rests in the slot of the valve stem between theknife edges 43 and 44. At its opposite end an anti-friction roller 49 isprovided which engages an angular projection or trip 50 provided on theportion 34 of the thermostatic member. A tension spring 51 is connectedwith the lever 46, at its upper end, and is also connected with theportion 34 of the thermostatic member at a point 52 approximately inline with the apex of the trip 50, as shown in the drawings. A similarspring is arranged at the opposite side of the device and connected inthe same manner.

As shown in Fig. 1, theouter casing is provided with a lower portion 53surrounding the burner, and having a door 54 for lighting the same. Legs55 are provided upon which the whole apparatus is supported.

The operation of my improved tank water heater is as follows: Cold waterenters the tank 1 through the cold water supply-pipe 6 and passes intothe circulating copper tube 8 either directly through the opening 28shown in Fig. 6, around the burner as in Figs. 7 and 8, or by way of thewater channels arranged around the burner, as shown in Figs. 2 and 4.The heated water circu- -lates through the copper tube 8, and passesback into the water tank at l1, and also through the outlet pipe 12 foruse when intended. lVhen the Water becomes heated to a predeterminedtemperature at the lower part of the tank, the thermostatic member 35 isaffected to operate the valve 39 -to cut off the supply of .gas to theburner. The said valve is caused to operate in the following Inanner:`When the temperature rises as before stated, the rod 34 is movedforwardly against the force of the spring 36, and as soon as the pointof the trip 50 of the said rod passes the center line of theantifriction roller 49, the springs 51 pull the lever 48 toward the rod34, the antifriction roller 49 riding upon the inclined face of thetrip, throwing rapidly outward with a snap action the lower end of thesaid lever 48,` thereby moving the valve-stem 42 and valve 39 toward thevalve seat 38 and cutting oil' the gas sup ly. `When the temperature isreducedsu ciently, the valve is again opened with a snap action in thesame way, the various parts operating in reverse direction.

I have illustrated preferred and satisfactory forms of my invention, butit is obvious changes may be made therein without departing from thespirit and scope thereof, as defined in the appended claims.

1. In a tank water heater, a water tank provided with a central uprightcore having a lower cylindrical portion of relatively large diameter,and an upper cylindrical portion of smaller diameter than said lowerportion, a circulating water coil connected with the tank and arrangedin said core, and having a lower portion having superimposed equaldiameter convolutions of relatively large diameter, said lower portionofsaid coil terminating within said lower c vlindrical portion of saidcore, and an upper portion having superimposed equal diameterconvolutions of relatively small diameter and extending through saidupper portion of said core. the diameter of the clear space surroundedby the lower portion of the coil being greater than the outer diameterof the upper coil portion, and heating means located beneath said tankand coil.

2. In a tank water heater, a water tank provided with a core, means -forsupplying water to said tank, a circulating water tube passing throughsaid core, means for heating said circulating tube, a water channelsurrounding said heating means, means connecting said water tank withsaid water channel. and means connecting said water channel with saidcirculating tube.

3. In a tank water heater, a water tank provided with a core, means forsupplying water to said tank, a circulating water tube passing throughsaid core, means for heating said circulating tube, a Water channelarranged about said heating means, a partition arranged in said Waterchannel, means at one side of said partition connecting the said Watertank With the said Water channel and means at the other side of saidpartition connecting'the said Water channel witl the said circulatingtube.

4. In a tank Water heater, a Water tank provided With a core, means Jforsupplying Water to said tank, a circulating Water tube arranged Withinsaid core, means for heating said tube, a Water channel surrounding saidheating means, and connections extending from said Water channel to thelower portions of said tank and of said tube respectively.

5. In a tank Water heater, a Water tank provided with a core, means forsupplying Water to said tank, a 'circulating water tube arranged withinsaid core, means for heating said tube, a Water channel surrounding saidheating means and provided with a partition, and connections extendingfrom said channel, at opposite sides of said partition, to the lowerportions of said tank and of said circulating tube respectively.

In testimony, that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

lGERHARD'I F'. SCHWARTZ.

Witnesses J. M. MUiiPHY, B. FISHER.

